The authors study the change of the rate of growth of fatigue cracks that occur due to the damage of surface of an engine blade made of the alloy Ti-6Al-4V, previously processed by laser shockwaves, by foreign objects. The numerical study of the model of damaged laser-processed blade was performed by finite element method. The model developed took into consideration the residual stress fields that occurred due to the foreign object damage as well as the effect of the crack closure under compressive residual stresses. To cause the growth of fatigue cracks, the blade was stressed using real operation modes, including low-and high-cycle fatigue and the combination thereof. The residual stresses, previously inserted into laser shock processing blade surface, complicate the origin and growth of fatigue cracks after the foreign object damage, extending the service life of the blade and the entire engine.
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